1 /*
2 * Copyright (c) 1999, 2022, Oracle and/or its affiliates. All rights reserved.
3 * Copyright (c) 2014, 2021, Red Hat Inc. All rights reserved.
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This code is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 only, as
8 * published by the Free Software Foundation.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 *
24 */
25
26 #include "precompiled.hpp"
27 #include "asm/assembler.hpp"
28 #include "c1/c1_CodeStubs.hpp"
29 #include "c1/c1_Defs.hpp"
30 #include "c1/c1_MacroAssembler.hpp"
31 #include "c1/c1_Runtime1.hpp"
32 #include "compiler/disassembler.hpp"
33 #include "compiler/oopMap.hpp"
34 #include "gc/shared/cardTable.hpp"
35 #include "gc/shared/cardTableBarrierSet.hpp"
36 #include "gc/shared/collectedHeap.hpp"
37 #include "gc/shared/tlab_globals.hpp"
38 #include "interpreter/interpreter.hpp"
39 #include "memory/universe.hpp"
40 #include "nativeInst_aarch64.hpp"
41 #include "oops/compiledICHolder.hpp"
42 #include "oops/oop.inline.hpp"
43 #include "prims/jvmtiExport.hpp"
44 #include "register_aarch64.hpp"
45 #include "runtime/sharedRuntime.hpp"
46 #include "runtime/signature.hpp"
47 #include "runtime/stubRoutines.hpp"
48 #include "runtime/vframe.hpp"
49 #include "runtime/vframeArray.hpp"
50 #include "utilities/powerOfTwo.hpp"
51 #include "vmreg_aarch64.inline.hpp"
52
53
54 // Implementation of StubAssembler
55
56 int StubAssembler::call_RT(Register oop_result1, Register metadata_result, address entry, int args_size) {
57 // setup registers
58 assert(!(oop_result1->is_valid() || metadata_result->is_valid()) || oop_result1 != metadata_result, "registers must be different");
59 assert(oop_result1 != rthread && metadata_result != rthread, "registers must be different");
60 assert(args_size >= 0, "illegal args_size");
61 bool align_stack = false;
62
63 mov(c_rarg0, rthread);
64 set_num_rt_args(0); // Nothing on stack
65
66 Label retaddr;
67 set_last_Java_frame(sp, rfp, retaddr, rscratch1);
68
69 // do the call
70 lea(rscratch1, RuntimeAddress(entry));
71 blr(rscratch1);
72 bind(retaddr);
73 int call_offset = offset();
74 // verify callee-saved register
75 #ifdef ASSERT
76 push(r0, sp);
77 { Label L;
78 get_thread(r0);
79 cmp(rthread, r0);
80 br(Assembler::EQ, L);
81 stop("StubAssembler::call_RT: rthread not callee saved?");
82 bind(L);
83 }
84 pop(r0, sp);
85 #endif
86 reset_last_Java_frame(true);
87
88 // check for pending exceptions
89 { Label L;
90 // check for pending exceptions (java_thread is set upon return)
91 ldr(rscratch1, Address(rthread, in_bytes(Thread::pending_exception_offset())));
92 cbz(rscratch1, L);
93 // exception pending => remove activation and forward to exception handler
94 // make sure that the vm_results are cleared
95 if (oop_result1->is_valid()) {
96 str(zr, Address(rthread, JavaThread::vm_result_offset()));
97 }
98 if (metadata_result->is_valid()) {
99 str(zr, Address(rthread, JavaThread::vm_result_2_offset()));
100 }
101 if (frame_size() == no_frame_size) {
102 leave();
103 far_jump(RuntimeAddress(StubRoutines::forward_exception_entry()));
104 } else if (_stub_id == Runtime1::forward_exception_id) {
105 should_not_reach_here();
106 } else {
107 far_jump(RuntimeAddress(Runtime1::entry_for(Runtime1::forward_exception_id)));
108 }
109 bind(L);
110 }
111 // get oop results if there are any and reset the values in the thread
112 if (oop_result1->is_valid()) {
113 get_vm_result(oop_result1, rthread);
114 }
115 if (metadata_result->is_valid()) {
116 get_vm_result_2(metadata_result, rthread);
117 }
118 return call_offset;
119 }
120
121
122 int StubAssembler::call_RT(Register oop_result1, Register metadata_result, address entry, Register arg1) {
123 mov(c_rarg1, arg1);
124 return call_RT(oop_result1, metadata_result, entry, 1);
125 }
126
127
128 int StubAssembler::call_RT(Register oop_result1, Register metadata_result, address entry, Register arg1, Register arg2) {
129 if (c_rarg1 == arg2) {
130 if (c_rarg2 == arg1) {
131 mov(rscratch1, arg1);
132 mov(arg1, arg2);
133 mov(arg2, rscratch1);
134 } else {
135 mov(c_rarg2, arg2);
136 mov(c_rarg1, arg1);
137 }
138 } else {
139 mov(c_rarg1, arg1);
140 mov(c_rarg2, arg2);
141 }
142 return call_RT(oop_result1, metadata_result, entry, 2);
143 }
144
145
146 int StubAssembler::call_RT(Register oop_result1, Register metadata_result, address entry, Register arg1, Register arg2, Register arg3) {
147 // if there is any conflict use the stack
148 if (arg1 == c_rarg2 || arg1 == c_rarg3 ||
149 arg2 == c_rarg1 || arg2 == c_rarg3 ||
150 arg3 == c_rarg1 || arg3 == c_rarg2) {
151 stp(arg3, arg2, Address(pre(sp, -2 * wordSize)));
152 stp(arg1, zr, Address(pre(sp, -2 * wordSize)));
153 ldp(c_rarg1, zr, Address(post(sp, 2 * wordSize)));
154 ldp(c_rarg3, c_rarg2, Address(post(sp, 2 * wordSize)));
155 } else {
156 mov(c_rarg1, arg1);
157 mov(c_rarg2, arg2);
158 mov(c_rarg3, arg3);
159 }
160 return call_RT(oop_result1, metadata_result, entry, 3);
161 }
162
163 enum return_state_t {
164 does_not_return, requires_return
165 };
166
167
168 // Implementation of StubFrame
169
170 class StubFrame: public StackObj {
171 private:
172 StubAssembler* _sasm;
173 bool _return_state;
174
175 public:
176 StubFrame(StubAssembler* sasm, const char* name, bool must_gc_arguments, return_state_t return_state=requires_return);
177 void load_argument(int offset_in_words, Register reg);
178
179 ~StubFrame();
180 };;
181
182 void StubAssembler::prologue(const char* name, bool must_gc_arguments) {
183 set_info(name, must_gc_arguments);
184 enter();
185 }
186
187 void StubAssembler::epilogue() {
188 leave();
189 ret(lr);
190 }
191
192 #define __ _sasm->
193
194 StubFrame::StubFrame(StubAssembler* sasm, const char* name, bool must_gc_arguments, return_state_t return_state) {
195 _sasm = sasm;
196 _return_state = return_state;
197 __ prologue(name, must_gc_arguments);
198 }
199
200 // load parameters that were stored with LIR_Assembler::store_parameter
201 // Note: offsets for store_parameter and load_argument must match
202 void StubFrame::load_argument(int offset_in_words, Register reg) {
203 __ load_parameter(offset_in_words, reg);
204 }
205
206 StubFrame::~StubFrame() {
207 if (_return_state == requires_return) {
208 __ epilogue();
209 } else {
210 __ should_not_reach_here();
211 }
212 }
213
214 #undef __
215
216
217 // Implementation of Runtime1
218
219 #define __ sasm->
220
221 const int float_regs_as_doubles_size_in_slots = pd_nof_fpu_regs_frame_map * 2;
222
223 // Stack layout for saving/restoring all the registers needed during a runtime
224 // call (this includes deoptimization)
225 // Note: note that users of this frame may well have arguments to some runtime
226 // while these values are on the stack. These positions neglect those arguments
227 // but the code in save_live_registers will take the argument count into
228 // account.
229 //
230
231 enum reg_save_layout {
232 reg_save_frame_size = 32 /* float */ + 32 /* integer */
233 };
234
235 // Save off registers which might be killed by calls into the runtime.
236 // Tries to smart of about FP registers. In particular we separate
237 // saving and describing the FPU registers for deoptimization since we
238 // have to save the FPU registers twice if we describe them. The
239 // deopt blob is the only thing which needs to describe FPU registers.
240 // In all other cases it should be sufficient to simply save their
241 // current value.
242
243 static int cpu_reg_save_offsets[FrameMap::nof_cpu_regs];
244 static int fpu_reg_save_offsets[FrameMap::nof_fpu_regs];
245 static int reg_save_size_in_words;
246 static int frame_size_in_bytes = -1;
247
248 static OopMap* generate_oop_map(StubAssembler* sasm, bool save_fpu_registers) {
249 int frame_size_in_bytes = reg_save_frame_size * BytesPerWord;
250 sasm->set_frame_size(frame_size_in_bytes / BytesPerWord);
251 int frame_size_in_slots = frame_size_in_bytes / sizeof(jint);
252 OopMap* oop_map = new OopMap(frame_size_in_slots, 0);
253
254 for (int i = 0; i < FrameMap::nof_cpu_regs; i++) {
255 Register r = as_Register(i);
256 if (i <= 18 && i != rscratch1->encoding() && i != rscratch2->encoding()) {
257 int sp_offset = cpu_reg_save_offsets[i];
258 oop_map->set_callee_saved(VMRegImpl::stack2reg(sp_offset),
259 r->as_VMReg());
260 }
261 }
262
263 if (save_fpu_registers) {
264 for (int i = 0; i < FrameMap::nof_fpu_regs; i++) {
265 FloatRegister r = as_FloatRegister(i);
266 {
267 int sp_offset = fpu_reg_save_offsets[i];
268 oop_map->set_callee_saved(VMRegImpl::stack2reg(sp_offset),
269 r->as_VMReg());
270 }
271 }
272 }
273 return oop_map;
274 }
275
276 static OopMap* save_live_registers(StubAssembler* sasm,
277 bool save_fpu_registers = true) {
278 __ block_comment("save_live_registers");
279
280 __ push(RegSet::range(r0, r29), sp); // integer registers except lr & sp
281
282 if (save_fpu_registers) {
283 for (int i = 31; i>= 0; i -= 4) {
284 __ sub(sp, sp, 4 * wordSize); // no pre-increment for st1. Emulate it without modifying other registers
285 __ st1(as_FloatRegister(i-3), as_FloatRegister(i-2), as_FloatRegister(i-1),
286 as_FloatRegister(i), __ T1D, Address(sp));
287 }
288 } else {
289 __ add(sp, sp, -32 * wordSize);
290 }
291
292 return generate_oop_map(sasm, save_fpu_registers);
293 }
294
295 static void restore_live_registers(StubAssembler* sasm, bool restore_fpu_registers = true) {
296 if (restore_fpu_registers) {
297 for (int i = 0; i < 32; i += 4)
298 __ ld1(as_FloatRegister(i), as_FloatRegister(i+1), as_FloatRegister(i+2),
299 as_FloatRegister(i+3), __ T1D, Address(__ post(sp, 4 * wordSize)));
300 } else {
301 __ add(sp, sp, 32 * wordSize);
302 }
303
304 __ pop(RegSet::range(r0, r29), sp);
305 }
306
307 static void restore_live_registers_except_r0(StubAssembler* sasm, bool restore_fpu_registers = true) {
308
309 if (restore_fpu_registers) {
310 for (int i = 0; i < 32; i += 4)
311 __ ld1(as_FloatRegister(i), as_FloatRegister(i+1), as_FloatRegister(i+2),
312 as_FloatRegister(i+3), __ T1D, Address(__ post(sp, 4 * wordSize)));
313 } else {
314 __ add(sp, sp, 32 * wordSize);
315 }
316
317 __ ldp(zr, r1, Address(__ post(sp, 16)));
318 __ pop(RegSet::range(r2, r29), sp);
319 }
320
321
322
323 void Runtime1::initialize_pd() {
324 int i;
325 int sp_offset = 0;
326
327 // all float registers are saved explicitly
328 assert(FrameMap::nof_fpu_regs == 32, "double registers not handled here");
329 for (i = 0; i < FrameMap::nof_fpu_regs; i++) {
330 fpu_reg_save_offsets[i] = sp_offset;
331 sp_offset += 2; // SP offsets are in halfwords
332 }
333
334 for (i = 0; i < FrameMap::nof_cpu_regs; i++) {
335 Register r = as_Register(i);
336 cpu_reg_save_offsets[i] = sp_offset;
337 sp_offset += 2; // SP offsets are in halfwords
338 }
339 }
340
341
342 // target: the entry point of the method that creates and posts the exception oop
343 // has_argument: true if the exception needs arguments (passed in rscratch1 and rscratch2)
344
345 OopMapSet* Runtime1::generate_exception_throw(StubAssembler* sasm, address target, bool has_argument) {
346 // make a frame and preserve the caller's caller-save registers
347 OopMap* oop_map = save_live_registers(sasm);
348 int call_offset;
349 if (!has_argument) {
350 call_offset = __ call_RT(noreg, noreg, target);
351 } else {
352 __ mov(c_rarg1, rscratch1);
353 __ mov(c_rarg2, rscratch2);
354 call_offset = __ call_RT(noreg, noreg, target);
355 }
356 OopMapSet* oop_maps = new OopMapSet();
357 oop_maps->add_gc_map(call_offset, oop_map);
358 return oop_maps;
359 }
360
361
362 OopMapSet* Runtime1::generate_handle_exception(StubID id, StubAssembler *sasm) {
363 __ block_comment("generate_handle_exception");
364
365 // incoming parameters
366 const Register exception_oop = r0;
367 const Register exception_pc = r3;
368 // other registers used in this stub
369
370 // Save registers, if required.
371 OopMapSet* oop_maps = new OopMapSet();
372 OopMap* oop_map = NULL;
373 switch (id) {
374 case forward_exception_id:
375 // We're handling an exception in the context of a compiled frame.
376 // The registers have been saved in the standard places. Perform
377 // an exception lookup in the caller and dispatch to the handler
378 // if found. Otherwise unwind and dispatch to the callers
379 // exception handler.
380 oop_map = generate_oop_map(sasm, 1 /*thread*/);
381
382 // load and clear pending exception oop into r0
383 __ ldr(exception_oop, Address(rthread, Thread::pending_exception_offset()));
384 __ str(zr, Address(rthread, Thread::pending_exception_offset()));
385
386 // load issuing PC (the return address for this stub) into r3
387 __ ldr(exception_pc, Address(rfp, 1*BytesPerWord));
388 __ authenticate_return_address(exception_pc, rscratch1);
389
390 // make sure that the vm_results are cleared (may be unnecessary)
391 __ str(zr, Address(rthread, JavaThread::vm_result_offset()));
392 __ str(zr, Address(rthread, JavaThread::vm_result_2_offset()));
393 break;
394 case handle_exception_nofpu_id:
395 case handle_exception_id:
396 // At this point all registers MAY be live.
397 oop_map = save_live_registers(sasm, id != handle_exception_nofpu_id);
398 break;
399 case handle_exception_from_callee_id: {
400 // At this point all registers except exception oop (r0) and
401 // exception pc (lr) are dead.
402 const int frame_size = 2 /*fp, return address*/;
403 oop_map = new OopMap(frame_size * VMRegImpl::slots_per_word, 0);
404 sasm->set_frame_size(frame_size);
405 break;
406 }
407 default: ShouldNotReachHere();
408 }
409
410 // verify that only r0 and r3 are valid at this time
411 __ invalidate_registers(false, true, true, false, true, true);
412 // verify that r0 contains a valid exception
413 __ verify_not_null_oop(exception_oop);
414
415 #ifdef ASSERT
416 // check that fields in JavaThread for exception oop and issuing pc are
417 // empty before writing to them
418 Label oop_empty;
419 __ ldr(rscratch1, Address(rthread, JavaThread::exception_oop_offset()));
420 __ cbz(rscratch1, oop_empty);
421 __ stop("exception oop already set");
422 __ bind(oop_empty);
423
424 Label pc_empty;
425 __ ldr(rscratch1, Address(rthread, JavaThread::exception_pc_offset()));
426 __ cbz(rscratch1, pc_empty);
427 __ stop("exception pc already set");
428 __ bind(pc_empty);
429 #endif
430
431 // save exception oop and issuing pc into JavaThread
432 // (exception handler will load it from here)
433 __ str(exception_oop, Address(rthread, JavaThread::exception_oop_offset()));
434 __ str(exception_pc, Address(rthread, JavaThread::exception_pc_offset()));
435
436 // patch throwing pc into return address (has bci & oop map)
437 __ protect_return_address(exception_pc, rscratch1);
438 __ str(exception_pc, Address(rfp, 1*BytesPerWord));
439
440 // compute the exception handler.
441 // the exception oop and the throwing pc are read from the fields in JavaThread
442 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, exception_handler_for_pc));
443 oop_maps->add_gc_map(call_offset, oop_map);
444
445 // r0: handler address
446 // will be the deopt blob if nmethod was deoptimized while we looked up
447 // handler regardless of whether handler existed in the nmethod.
448
449 // only r0 is valid at this time, all other registers have been destroyed by the runtime call
450 __ invalidate_registers(false, true, true, true, true, true);
451
452 // patch the return address, this stub will directly return to the exception handler
453 __ protect_return_address(r0, rscratch1);
454 __ str(r0, Address(rfp, 1*BytesPerWord));
455
456 switch (id) {
457 case forward_exception_id:
458 case handle_exception_nofpu_id:
459 case handle_exception_id:
460 // Restore the registers that were saved at the beginning.
461 restore_live_registers(sasm, id != handle_exception_nofpu_id);
462 break;
463 case handle_exception_from_callee_id:
464 break;
465 default: ShouldNotReachHere();
466 }
467
468 return oop_maps;
469 }
470
471
472 void Runtime1::generate_unwind_exception(StubAssembler *sasm) {
473 // incoming parameters
474 const Register exception_oop = r0;
475 // callee-saved copy of exception_oop during runtime call
476 const Register exception_oop_callee_saved = r19;
477 // other registers used in this stub
478 const Register exception_pc = r3;
479 const Register handler_addr = r1;
480
481 // verify that only r0, is valid at this time
482 __ invalidate_registers(false, true, true, true, true, true);
483
484 #ifdef ASSERT
485 // check that fields in JavaThread for exception oop and issuing pc are empty
486 Label oop_empty;
487 __ ldr(rscratch1, Address(rthread, JavaThread::exception_oop_offset()));
488 __ cbz(rscratch1, oop_empty);
489 __ stop("exception oop must be empty");
490 __ bind(oop_empty);
491
492 Label pc_empty;
493 __ ldr(rscratch1, Address(rthread, JavaThread::exception_pc_offset()));
494 __ cbz(rscratch1, pc_empty);
495 __ stop("exception pc must be empty");
496 __ bind(pc_empty);
497 #endif
498
499 // Save our return address because
500 // exception_handler_for_return_address will destroy it. We also
501 // save exception_oop
502 __ mov(r3, lr);
503 __ protect_return_address();
504 __ stp(lr, exception_oop, Address(__ pre(sp, -2 * wordSize)));
505
506 // search the exception handler address of the caller (using the return address)
507 __ call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::exception_handler_for_return_address), rthread, r3);
508 // r0: exception handler address of the caller
509
510 // Only R0 is valid at this time; all other registers have been
511 // destroyed by the call.
512 __ invalidate_registers(false, true, true, true, false, true);
513
514 // move result of call into correct register
515 __ mov(handler_addr, r0);
516
517 // get throwing pc (= return address).
518 // lr has been destroyed by the call
519 __ ldp(lr, exception_oop, Address(__ post(sp, 2 * wordSize)));
520 __ authenticate_return_address();
521 __ mov(r3, lr);
522
523 __ verify_not_null_oop(exception_oop);
524
525 // continue at exception handler (return address removed)
526 // note: do *not* remove arguments when unwinding the
527 // activation since the caller assumes having
528 // all arguments on the stack when entering the
529 // runtime to determine the exception handler
530 // (GC happens at call site with arguments!)
531 // r0: exception oop
532 // r3: throwing pc
533 // r1: exception handler
534 __ br(handler_addr);
535 }
536
537
538
539 OopMapSet* Runtime1::generate_patching(StubAssembler* sasm, address target) {
540 // use the maximum number of runtime-arguments here because it is difficult to
541 // distinguish each RT-Call.
542 // Note: This number affects also the RT-Call in generate_handle_exception because
543 // the oop-map is shared for all calls.
544 DeoptimizationBlob* deopt_blob = SharedRuntime::deopt_blob();
545 assert(deopt_blob != NULL, "deoptimization blob must have been created");
546
547 OopMap* oop_map = save_live_registers(sasm);
548
549 __ mov(c_rarg0, rthread);
550 Label retaddr;
551 __ set_last_Java_frame(sp, rfp, retaddr, rscratch1);
552 // do the call
553 __ lea(rscratch1, RuntimeAddress(target));
554 __ blr(rscratch1);
555 __ bind(retaddr);
556 OopMapSet* oop_maps = new OopMapSet();
557 oop_maps->add_gc_map(__ offset(), oop_map);
558 // verify callee-saved register
559 #ifdef ASSERT
560 { Label L;
561 __ get_thread(rscratch1);
562 __ cmp(rthread, rscratch1);
563 __ br(Assembler::EQ, L);
564 __ stop("StubAssembler::call_RT: rthread not callee saved?");
565 __ bind(L);
566 }
567 #endif
568
569 __ reset_last_Java_frame(true);
570
571 #ifdef ASSERT
572 // check that fields in JavaThread for exception oop and issuing pc are empty
573 Label oop_empty;
574 __ ldr(rscratch1, Address(rthread, Thread::pending_exception_offset()));
575 __ cbz(rscratch1, oop_empty);
576 __ stop("exception oop must be empty");
577 __ bind(oop_empty);
578
579 Label pc_empty;
580 __ ldr(rscratch1, Address(rthread, JavaThread::exception_pc_offset()));
581 __ cbz(rscratch1, pc_empty);
582 __ stop("exception pc must be empty");
583 __ bind(pc_empty);
584 #endif
585
586 // Runtime will return true if the nmethod has been deoptimized, this is the
587 // expected scenario and anything else is an error. Note that we maintain a
588 // check on the result purely as a defensive measure.
589 Label no_deopt;
590 __ cbz(r0, no_deopt); // Have we deoptimized?
591
592 // Perform a re-execute. The proper return address is already on the stack,
593 // we just need to restore registers, pop all of our frame but the return
594 // address and jump to the deopt blob.
595 restore_live_registers(sasm);
596 __ leave();
597 __ far_jump(RuntimeAddress(deopt_blob->unpack_with_reexecution()));
598
599 __ bind(no_deopt);
600 __ stop("deopt not performed");
601
602 return oop_maps;
603 }
604
605
606 OopMapSet* Runtime1::generate_code_for(StubID id, StubAssembler* sasm) {
607
608 const Register exception_oop = r0;
609 const Register exception_pc = r3;
610
611 // for better readability
612 const bool must_gc_arguments = true;
613 const bool dont_gc_arguments = false;
614
615 // default value; overwritten for some optimized stubs that are called from methods that do not use the fpu
616 bool save_fpu_registers = true;
617
618 // stub code & info for the different stubs
619 OopMapSet* oop_maps = NULL;
620 OopMap* oop_map = NULL;
621 switch (id) {
622 {
623 case forward_exception_id:
624 {
625 oop_maps = generate_handle_exception(id, sasm);
626 __ leave();
627 __ ret(lr);
628 }
629 break;
630
631 case throw_div0_exception_id:
632 { StubFrame f(sasm, "throw_div0_exception", dont_gc_arguments, does_not_return);
633 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_div0_exception), false);
634 }
635 break;
636
637 case throw_null_pointer_exception_id:
638 { StubFrame f(sasm, "throw_null_pointer_exception", dont_gc_arguments, does_not_return);
639 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_null_pointer_exception), false);
640 }
641 break;
642
643 case new_instance_id:
644 case fast_new_instance_id:
645 case fast_new_instance_init_check_id:
646 {
647 Register klass = r3; // Incoming
648 Register obj = r0; // Result
649
650 if (id == new_instance_id) {
651 __ set_info("new_instance", dont_gc_arguments);
652 } else if (id == fast_new_instance_id) {
653 __ set_info("fast new_instance", dont_gc_arguments);
654 } else {
655 assert(id == fast_new_instance_init_check_id, "bad StubID");
656 __ set_info("fast new_instance init check", dont_gc_arguments);
657 }
658
659 // If TLAB is disabled, see if there is support for inlining contiguous
660 // allocations.
661 // Otherwise, just go to the slow path.
662 if ((id == fast_new_instance_id || id == fast_new_instance_init_check_id) &&
663 !UseTLAB && Universe::heap()->supports_inline_contig_alloc()) {
664 Label slow_path;
665 Register obj_size = r19;
666 Register t1 = r10;
667 Register t2 = r11;
668 assert_different_registers(klass, obj, obj_size, t1, t2);
669
670 __ stp(r19, zr, Address(__ pre(sp, -2 * wordSize)));
671
672 if (id == fast_new_instance_init_check_id) {
673 // make sure the klass is initialized
674 __ ldrb(rscratch1, Address(klass, InstanceKlass::init_state_offset()));
675 __ cmpw(rscratch1, InstanceKlass::fully_initialized);
676 __ br(Assembler::NE, slow_path);
677 }
678
679 #ifdef ASSERT
680 // assert object can be fast path allocated
681 {
682 Label ok, not_ok;
683 __ ldrw(obj_size, Address(klass, Klass::layout_helper_offset()));
684 __ cmp(obj_size, (u1)0);
685 __ br(Assembler::LE, not_ok); // make sure it's an instance (LH > 0)
686 __ tstw(obj_size, Klass::_lh_instance_slow_path_bit);
687 __ br(Assembler::EQ, ok);
688 __ bind(not_ok);
689 __ stop("assert(can be fast path allocated)");
690 __ should_not_reach_here();
691 __ bind(ok);
692 }
693 #endif // ASSERT
694
695 // get the instance size (size is positive so movl is fine for 64bit)
696 __ ldrw(obj_size, Address(klass, Klass::layout_helper_offset()));
697
698 __ eden_allocate(obj, obj_size, 0, t1, slow_path);
699
700 __ initialize_object(obj, klass, obj_size, 0, t1, t2, /* is_tlab_allocated */ false);
701 __ verify_oop(obj);
702 __ ldp(r19, zr, Address(__ post(sp, 2 * wordSize)));
703 __ ret(lr);
704
705 __ bind(slow_path);
706 __ ldp(r19, zr, Address(__ post(sp, 2 * wordSize)));
707 }
708
709 __ enter();
710 OopMap* map = save_live_registers(sasm);
711 int call_offset = __ call_RT(obj, noreg, CAST_FROM_FN_PTR(address, new_instance), klass);
712 oop_maps = new OopMapSet();
713 oop_maps->add_gc_map(call_offset, map);
714 restore_live_registers_except_r0(sasm);
715 __ verify_oop(obj);
716 __ leave();
717 __ ret(lr);
718
719 // r0,: new instance
720 }
721
722 break;
723
724 case counter_overflow_id:
725 {
726 Register bci = r0, method = r1;
727 __ enter();
728 OopMap* map = save_live_registers(sasm);
729 // Retrieve bci
730 __ ldrw(bci, Address(rfp, 2*BytesPerWord));
731 // And a pointer to the Method*
732 __ ldr(method, Address(rfp, 3*BytesPerWord));
733 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, counter_overflow), bci, method);
734 oop_maps = new OopMapSet();
735 oop_maps->add_gc_map(call_offset, map);
736 restore_live_registers(sasm);
737 __ leave();
738 __ ret(lr);
739 }
740 break;
741
742 case new_type_array_id:
743 case new_object_array_id:
744 {
745 Register length = r19; // Incoming
746 Register klass = r3; // Incoming
747 Register obj = r0; // Result
748
749 if (id == new_type_array_id) {
750 __ set_info("new_type_array", dont_gc_arguments);
751 } else {
752 __ set_info("new_object_array", dont_gc_arguments);
753 }
754
755 #ifdef ASSERT
756 // assert object type is really an array of the proper kind
757 {
758 Label ok;
759 Register t0 = obj;
760 __ ldrw(t0, Address(klass, Klass::layout_helper_offset()));
761 __ asrw(t0, t0, Klass::_lh_array_tag_shift);
762 int tag = ((id == new_type_array_id)
763 ? Klass::_lh_array_tag_type_value
764 : Klass::_lh_array_tag_obj_value);
765 __ mov(rscratch1, tag);
766 __ cmpw(t0, rscratch1);
767 __ br(Assembler::EQ, ok);
768 __ stop("assert(is an array klass)");
769 __ should_not_reach_here();
770 __ bind(ok);
771 }
772 #endif // ASSERT
773
774 // If TLAB is disabled, see if there is support for inlining contiguous
775 // allocations.
776 // Otherwise, just go to the slow path.
777 if (!UseTLAB && Universe::heap()->supports_inline_contig_alloc()) {
778 Register arr_size = r5;
779 Register t1 = r10;
780 Register t2 = r11;
781 Label slow_path;
782 assert_different_registers(length, klass, obj, arr_size, t1, t2);
783
784 // check that array length is small enough for fast path.
785 __ mov(rscratch1, C1_MacroAssembler::max_array_allocation_length);
786 __ cmpw(length, rscratch1);
787 __ br(Assembler::HI, slow_path);
788
789 // get the allocation size: round_up(hdr + length << (layout_helper & 0x1F))
790 // since size is positive ldrw does right thing on 64bit
791 __ ldrw(t1, Address(klass, Klass::layout_helper_offset()));
792 // since size is positive movw does right thing on 64bit
793 __ movw(arr_size, length);
794 __ lslvw(arr_size, length, t1);
795 __ ubfx(t1, t1, Klass::_lh_header_size_shift,
796 exact_log2(Klass::_lh_header_size_mask + 1));
797 __ add(arr_size, arr_size, t1);
798 __ add(arr_size, arr_size, MinObjAlignmentInBytesMask); // align up
799 __ andr(arr_size, arr_size, ~MinObjAlignmentInBytesMask);
800
801 __ eden_allocate(obj, arr_size, 0, t1, slow_path); // preserves arr_size
802
803 __ initialize_header(obj, klass, length, t1, t2);
804 __ ldrb(t1, Address(klass, in_bytes(Klass::layout_helper_offset()) + (Klass::_lh_header_size_shift / BitsPerByte)));
805 assert(Klass::_lh_header_size_shift % BitsPerByte == 0, "bytewise");
806 assert(Klass::_lh_header_size_mask <= 0xFF, "bytewise");
807 __ andr(t1, t1, Klass::_lh_header_size_mask);
808 __ sub(arr_size, arr_size, t1); // body length
809 __ add(t1, t1, obj); // body start
810 __ initialize_body(t1, arr_size, 0, t1, t2);
811 __ membar(Assembler::StoreStore);
812 __ verify_oop(obj);
813
814 __ ret(lr);
815
816 __ bind(slow_path);
817 }
818
819 __ enter();
820 OopMap* map = save_live_registers(sasm);
821 int call_offset;
822 if (id == new_type_array_id) {
823 call_offset = __ call_RT(obj, noreg, CAST_FROM_FN_PTR(address, new_type_array), klass, length);
824 } else {
825 call_offset = __ call_RT(obj, noreg, CAST_FROM_FN_PTR(address, new_object_array), klass, length);
826 }
827
828 oop_maps = new OopMapSet();
829 oop_maps->add_gc_map(call_offset, map);
830 restore_live_registers_except_r0(sasm);
831
832 __ verify_oop(obj);
833 __ leave();
834 __ ret(lr);
835
836 // r0: new array
837 }
838 break;
839
840 case new_multi_array_id:
841 { StubFrame f(sasm, "new_multi_array", dont_gc_arguments);
842 // r0,: klass
843 // r19,: rank
844 // r2: address of 1st dimension
845 OopMap* map = save_live_registers(sasm);
846 __ mov(c_rarg1, r0);
847 __ mov(c_rarg3, r2);
848 __ mov(c_rarg2, r19);
849 int call_offset = __ call_RT(r0, noreg, CAST_FROM_FN_PTR(address, new_multi_array), r1, r2, r3);
850
851 oop_maps = new OopMapSet();
852 oop_maps->add_gc_map(call_offset, map);
853 restore_live_registers_except_r0(sasm);
854
855 // r0,: new multi array
856 __ verify_oop(r0);
857 }
858 break;
859
860 case register_finalizer_id:
861 {
862 __ set_info("register_finalizer", dont_gc_arguments);
863
864 // This is called via call_runtime so the arguments
865 // will be place in C abi locations
866
867 __ verify_oop(c_rarg0);
868
869 // load the klass and check the has finalizer flag
870 Label register_finalizer;
871 Register t = r5;
872 __ load_klass(t, r0);
873 __ ldrw(t, Address(t, Klass::access_flags_offset()));
874 __ tbnz(t, exact_log2(JVM_ACC_HAS_FINALIZER), register_finalizer);
875 __ ret(lr);
876
877 __ bind(register_finalizer);
878 __ enter();
879 OopMap* oop_map = save_live_registers(sasm);
880 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, SharedRuntime::register_finalizer), r0);
881 oop_maps = new OopMapSet();
882 oop_maps->add_gc_map(call_offset, oop_map);
883
884 // Now restore all the live registers
885 restore_live_registers(sasm);
886
887 __ leave();
888 __ ret(lr);
889 }
890 break;
891
892 case throw_class_cast_exception_id:
893 { StubFrame f(sasm, "throw_class_cast_exception", dont_gc_arguments, does_not_return);
894 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_class_cast_exception), true);
895 }
896 break;
897
898 case throw_incompatible_class_change_error_id:
899 { StubFrame f(sasm, "throw_incompatible_class_cast_exception", dont_gc_arguments, does_not_return);
900 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_incompatible_class_change_error), false);
901 }
902 break;
903
904 case slow_subtype_check_id:
905 {
906 // Typical calling sequence:
907 // __ push(klass_RInfo); // object klass or other subclass
908 // __ push(sup_k_RInfo); // array element klass or other superclass
909 // __ bl(slow_subtype_check);
910 // Note that the subclass is pushed first, and is therefore deepest.
911 enum layout {
912 r0_off, r0_off_hi,
913 r2_off, r2_off_hi,
914 r4_off, r4_off_hi,
915 r5_off, r5_off_hi,
916 sup_k_off, sup_k_off_hi,
917 klass_off, klass_off_hi,
918 framesize,
919 result_off = sup_k_off
920 };
921
922 __ set_info("slow_subtype_check", dont_gc_arguments);
923 __ push(RegSet::of(r0, r2, r4, r5), sp);
924
925 // This is called by pushing args and not with C abi
926 // __ ldr(r4, Address(sp, (klass_off) * VMRegImpl::stack_slot_size)); // subclass
927 // __ ldr(r0, Address(sp, (sup_k_off) * VMRegImpl::stack_slot_size)); // superclass
928
929 __ ldp(r4, r0, Address(sp, (sup_k_off) * VMRegImpl::stack_slot_size));
930
931 Label miss;
932 __ check_klass_subtype_slow_path(r4, r0, r2, r5, NULL, &miss);
933
934 // fallthrough on success:
935 __ mov(rscratch1, 1);
936 __ str(rscratch1, Address(sp, (result_off) * VMRegImpl::stack_slot_size)); // result
937 __ pop(RegSet::of(r0, r2, r4, r5), sp);
938 __ ret(lr);
939
940 __ bind(miss);
941 __ str(zr, Address(sp, (result_off) * VMRegImpl::stack_slot_size)); // result
942 __ pop(RegSet::of(r0, r2, r4, r5), sp);
943 __ ret(lr);
944 }
945 break;
946
947 case monitorenter_nofpu_id:
948 save_fpu_registers = false;
949 // fall through
950 case monitorenter_id:
951 {
952 StubFrame f(sasm, "monitorenter", dont_gc_arguments);
953 OopMap* map = save_live_registers(sasm, save_fpu_registers);
954
955 // Called with store_parameter and not C abi
956
957 f.load_argument(1, r0); // r0,: object
958 f.load_argument(0, r1); // r1,: lock address
959
960 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, monitorenter), r0, r1);
961
962 oop_maps = new OopMapSet();
963 oop_maps->add_gc_map(call_offset, map);
964 restore_live_registers(sasm, save_fpu_registers);
965 }
966 break;
967
968 case monitorexit_nofpu_id:
969 save_fpu_registers = false;
970 // fall through
971 case monitorexit_id:
972 {
973 StubFrame f(sasm, "monitorexit", dont_gc_arguments);
974 OopMap* map = save_live_registers(sasm, save_fpu_registers);
975
976 // Called with store_parameter and not C abi
977
978 f.load_argument(0, r0); // r0,: lock address
979
980 // note: really a leaf routine but must setup last java sp
981 // => use call_RT for now (speed can be improved by
982 // doing last java sp setup manually)
983 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, monitorexit), r0);
984
985 oop_maps = new OopMapSet();
986 oop_maps->add_gc_map(call_offset, map);
987 restore_live_registers(sasm, save_fpu_registers);
988 }
989 break;
990
991 case deoptimize_id:
992 {
993 StubFrame f(sasm, "deoptimize", dont_gc_arguments, does_not_return);
994 OopMap* oop_map = save_live_registers(sasm);
995 f.load_argument(0, c_rarg1);
996 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, deoptimize), c_rarg1);
997
998 oop_maps = new OopMapSet();
999 oop_maps->add_gc_map(call_offset, oop_map);
1000 restore_live_registers(sasm);
1001 DeoptimizationBlob* deopt_blob = SharedRuntime::deopt_blob();
1002 assert(deopt_blob != NULL, "deoptimization blob must have been created");
1003 __ leave();
1004 __ far_jump(RuntimeAddress(deopt_blob->unpack_with_reexecution()));
1005 }
1006 break;
1007
1008 case throw_range_check_failed_id:
1009 { StubFrame f(sasm, "range_check_failed", dont_gc_arguments, does_not_return);
1010 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_range_check_exception), true);
1011 }
1012 break;
1013
1014 case unwind_exception_id:
1015 { __ set_info("unwind_exception", dont_gc_arguments);
1016 // note: no stubframe since we are about to leave the current
1017 // activation and we are calling a leaf VM function only.
1018 generate_unwind_exception(sasm);
1019 }
1020 break;
1021
1022 case access_field_patching_id:
1023 { StubFrame f(sasm, "access_field_patching", dont_gc_arguments, does_not_return);
1024 // we should set up register map
1025 oop_maps = generate_patching(sasm, CAST_FROM_FN_PTR(address, access_field_patching));
1026 }
1027 break;
1028
1029 case load_klass_patching_id:
1030 { StubFrame f(sasm, "load_klass_patching", dont_gc_arguments, does_not_return);
1031 // we should set up register map
1032 oop_maps = generate_patching(sasm, CAST_FROM_FN_PTR(address, move_klass_patching));
1033 }
1034 break;
1035
1036 case load_mirror_patching_id:
1037 { StubFrame f(sasm, "load_mirror_patching", dont_gc_arguments, does_not_return);
1038 // we should set up register map
1039 oop_maps = generate_patching(sasm, CAST_FROM_FN_PTR(address, move_mirror_patching));
1040 }
1041 break;
1042
1043 case load_appendix_patching_id:
1044 { StubFrame f(sasm, "load_appendix_patching", dont_gc_arguments, does_not_return);
1045 // we should set up register map
1046 oop_maps = generate_patching(sasm, CAST_FROM_FN_PTR(address, move_appendix_patching));
1047 }
1048 break;
1049
1050 case handle_exception_nofpu_id:
1051 case handle_exception_id:
1052 { StubFrame f(sasm, "handle_exception", dont_gc_arguments);
1053 oop_maps = generate_handle_exception(id, sasm);
1054 }
1055 break;
1056
1057 case handle_exception_from_callee_id:
1058 { StubFrame f(sasm, "handle_exception_from_callee", dont_gc_arguments);
1059 oop_maps = generate_handle_exception(id, sasm);
1060 }
1061 break;
1062
1063 case throw_index_exception_id:
1064 { StubFrame f(sasm, "index_range_check_failed", dont_gc_arguments, does_not_return);
1065 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_index_exception), true);
1066 }
1067 break;
1068
1069 case throw_array_store_exception_id:
1070 { StubFrame f(sasm, "throw_array_store_exception", dont_gc_arguments, does_not_return);
1071 // tos + 0: link
1072 // + 1: return address
1073 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_array_store_exception), true);
1074 }
1075 break;
1076
1077 case predicate_failed_trap_id:
1078 {
1079 StubFrame f(sasm, "predicate_failed_trap", dont_gc_arguments, does_not_return);
1080
1081 OopMap* map = save_live_registers(sasm);
1082
1083 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, predicate_failed_trap));
1084 oop_maps = new OopMapSet();
1085 oop_maps->add_gc_map(call_offset, map);
1086 restore_live_registers(sasm);
1087 __ leave();
1088 DeoptimizationBlob* deopt_blob = SharedRuntime::deopt_blob();
1089 assert(deopt_blob != NULL, "deoptimization blob must have been created");
1090
1091 __ far_jump(RuntimeAddress(deopt_blob->unpack_with_reexecution()));
1092 }
1093 break;
1094
1095 case dtrace_object_alloc_id:
1096 { // c_rarg0: object
1097 StubFrame f(sasm, "dtrace_object_alloc", dont_gc_arguments);
1098 save_live_registers(sasm);
1099
1100 __ call_VM_leaf(CAST_FROM_FN_PTR(address, static_cast<int (*)(oopDesc*)>(SharedRuntime::dtrace_object_alloc)), c_rarg0);
1101
1102 restore_live_registers(sasm);
1103 }
1104 break;
1105
1106 default:
1107 { StubFrame f(sasm, "unimplemented entry", dont_gc_arguments, does_not_return);
1108 __ mov(r0, (int)id);
1109 __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, unimplemented_entry), r0);
1110 }
1111 break;
1112 }
1113 }
1114 return oop_maps;
1115 }
1116
1117 #undef __
1118
1119 const char *Runtime1::pd_name_for_address(address entry) { Unimplemented(); return 0; }